As said, Mickey, the guy whos youtube account link I posted, is like a human encyclopedia on Electromechanical games. Most especially ball bowlers.
He may also know about the digitals as well, merely because I do not think there were too many digital ball bowlers. Puck bowlers seemed to take their place sadly.
Collectors like Mickey are invaluable to getting good information where none is easily found.
Post to the arcade/pinball/collector newsgroups, as well as the "KLOV" forums may also yield results.
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